Turbulent Transient Gas Injections

[+] Author and Article Information
P. Ouellette

Westport Research Inc., 1691 West 36th Avenue, Vancouver, British Columbia, Canada, V6N 2P9

P. G. Hill

Department of Mechanical Engineering, University of British Columbia, 2324 Main Mall, Vancouver, British Columbia, Canada, V6T 1Z4e-mail: hill@mech.ubc.ca

J. Fluids Eng 122(4), 743-752 (Jul 13, 1999) (10 pages) doi:10.1115/1.1319845 History: Revised July 13, 1999; Revised July 18, 2000
Copyright © 2000 by ASME
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Nondimensional penetration rate of turbulent methane jets issued from round nozzles of 2 different diameters. Un=409 m/s,ρna=3.2. Data from Miyake et al. 6. Both axis have units in [s1/2].
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Injector/nozzle interface for 2-d computational mesh
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Mesh and methane mass fraction for axisymmetric transient jet study
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Axial methane mass fraction at the jet forefront, corresponding to jet in Fig. 3
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Three-dimensional chamber and chamber-nozzle interface
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Nondimensional penetration rate and ratio of head vortex to jet tip for uncorrected and corrected turbulent model (simulations)
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Underexpansion process (from Ewan and Moodie 23)
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Nondimensional jet penetration for different underexpansion treatments. Po/pa=5.Tinj is the injection duration and dc is the corrected diameter. The percentage value indicates the reduction in computing time. Units of both axis in [s1/2].
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Comparison of predicted penetration rate with experimental data of Witze 11. Incompressible air jet into air, dn=1.2 mm.
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Schlieren photographs of jet in fixed volume chamber
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Comparison between experimental data and computations
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Effects of chamber turbulence on jet penetration (tkei is the initial turbulence kinetic energy in the chamber)
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Effects of injection duration on jet penetration (tinj is the injection duration)
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Mesh and equivalence ratio contour lines for gaseous jet (left) and for a diesel spray (right) for an equivalent momentum injection rate (dimensions in cm, df2 is diesel #2)
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Mixing rate of a gaseous jet and different sprays. Equivalence ratios of 0.5 and 2 were used to discriminate between lean, flammable and rich mixtures.




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